<template>
  <div class="xtx-cart-page">
    <div class="container">
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <XtxBreadItem>购物车</XtxBreadItem>
      </XtxBread>
      <div class="cart">
        <table>
          <thead>
            <tr>
              <th width="120">
                <XtxCheckbox v-model="isAll">全选</XtxCheckbox>
              </th>
              <th width="400">商品信息</th>
              <th width="220">单价</th>
              <th width="180">数量</th>
              <th width="180">小计</th>
              <th width="140">操作</th>
            </tr>
          </thead>
          <!-- 有效商品 -->
          <tbody>
            <tr v-for="item in effectiveCartList" :key="item.skuId">
              <td>
                <XtxCheckbox
                  :modelValue="item.selected"
                  @change="(selected) => handleCartSelected(item.skuId, selected, item.count)"
                  />
              </td>
              <td>
                <div class="goods">
                  <RouterLink to="/">
                    <img :src="item.picture" alt="picture">
                  </RouterLink>
                  <div>
                    <p class="name ellipsis">{{ item.name }}</p>
                    <p class="attr">{{ item.attrsText }}</p>
                  </div>
                </div>
              </td>
              <td class="tc">
                <span>&yen;{{ Number(item.nowPrice).toFixed(2) }}</span>
                <p v-if="item.price > item.nowPrice ">比加入时降价 <span class="red">&yen;{{ (+item.price - item.nowPrice).toFixed(2) }}</span></p>
              </td>
              <td class="tc">
                <!--
                  注意事项：
                    当vuex遇到了v-model指令需要怎么处理：
                      1. 不能直接把state中的数据绑定在v-model上（因为v-model是双向绑定的，
                        会直接修改state的数据、但是vuex的理念state的修改必须经过mutation，
                        这样就违背了vuex理念
                      2. 正确的方式
                          vue3中v-model的原理就是给所在标签(或组件)传递
                          modelValue属性 + 监听update:modelValue
                          这里需要自己来分别处理这两步，用自己的方式来重写v-model的本质
                 -->
                <XtxNumbox
                  :show-label="false"
                  :modelValue="item.count"
                  :max="item.stock"
                  @update:modelValue="(count) => handleUpdateCartCount(item.skuId, count)"
                  />
              </td>
              <td class="tc"><p class="f16 red">&yen;{{ (item.nowPrice * item.count).toFixed(2) }}</p></td>
              <td class="tc">
                <p><a href="javascript:;">移入收藏夹</a></p>
                <p><a class="green" href="javascript:;" @click="$store.dispatch('cart/delCartAction', item.skuId)">删除</a></p>
                <p><a href="javascript:;">找相似</a></p>
              </td>
            </tr>
          </tbody>
          <!-- 无效商品 -->
          <tbody v-if="noneffectiveCartList.length">
            <tr><td colspan="6"><h3 class="tit">失效商品</h3></td></tr>
            <tr v-for="item in noneffectiveCartList" :key="item.skuId">
              <td></td>
              <td>
                <div class="goods">
                  <RouterLink to="/">
                    <img :src="item.picture" alt="picture">
                  </RouterLink>
                  <div>
                    <p class="name ellipsis">{{ item.name }}</p>
                    <p class="attr">{{ item.attrsText }}</p>
                  </div>
                </div>
              </td>
              <td class="tc"><p>&yen;{{ item.nowPrice }}</p></td>
              <td class="tc">{{ item.count }}</td>
              <td class="tc"><p>&yen;{{ (+item.nowPrice * item.count).toFixed(2) }}</p></td>
              <td class="tc">
                <p><a class="green" href="javascript:;">删除</a></p>
                <p><a href="javascript:;">找相似</a></p>
              </td>
            </tr>
          </tbody>
        </table>
      </div>
      <!-- 操作栏 -->
      <div class="action">
        <div class="batch"></div>
        <div class="total">
          共 {{ effectiveTotalCount }} 件有效商品，已选择 {{ allSelectedTotalCount }} 件，商品合计：
          <span class="red">¥{{ allSelectedTotalAmount.toFixed(2) }}</span>
          <XtxButton type="primary" @click="handleOrderSettlement">下单结算</XtxButton>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { useStore } from 'vuex'
import { computed } from 'vue'
import { message } from '@/components/Message'
import { useRouter } from 'vue-router'
export default {
  name: 'XtxCartPage',
  setup () {
    const store = useStore()
    const router = useRouter()
    // 有效的购物车列表
    const effectiveCartList = computed(() => {
      return store.getters['cart/effectiveCartList']
    })
    //  无效的购物车列表
    const noneffectiveCartList = computed(() => {
      return store.getters['cart/noneffectiveCartList']
    })
    // 有效的商品总数量
    const effectiveTotalCount = computed(() => {
      return store.getters['cart/effectiveTotalCount']
    })
    // 选中的商品总数量
    const allSelectedTotalCount = computed(() => {
      return store.getters['cart/allSelectedTotalCount']
    })
    // 选中的商品总价
    const allSelectedTotalAmount = computed(() => {
      return store.getters['cart/allSelectedTotalAmount']
    })

    // 实现全选复选框的选中与切换动作
    const isAll = computed({
      get () {
        return store.getters['cart/isAllSelected']
      },
      set (selected) {
        store.dispatch('cart/toggleAllCartListAction', selected)
      }
    })

    // 更新指定商品数量
    const handleUpdateCartCount = (skuId, count) => {
      store.dispatch('cart/updateCartCountAction', { skuId, count })
    }

    // 更新指定商品的选中状态
    const handleCartSelected = (skuId, selected, count) => {
      store.dispatch('cart/updateCartSelectedAction', { skuId, selected, count })
    }

    // 点击去下单结算页
    const handleOrderSettlement = () => {
      // 1. 判断是否登录
      if (!store.getters.token) {
        return message({ type: 'warn', text: '请登录' })
      }
      // 2. 判断是否选择了商品
      // 选中的商品总数为零，代表没有选择商品
      if (!store.getters['cart/allSelectedTotalCount']) {
        return message({ type: 'warn', text: '请选择商品' })
      }
      // 3. 跳转至结算页
      router.push('/settlement')
    }

    return {
      effectiveCartList,
      handleUpdateCartCount,
      handleCartSelected,
      noneffectiveCartList,
      effectiveTotalCount,
      allSelectedTotalCount,
      allSelectedTotalAmount,
      isAll,
      handleOrderSettlement
    }
  }
}
</script>
<style scoped lang="less">
.tc {
  text-align: center;
  .xtx-numbox {
    margin: 0 auto;
    width: 120px;
  }
}
.red {
  color: @priceColor;
}
.green {
  color: @xtxColor
}
.f16 {
  font-size: 16px;
}
.goods {
  display: flex;
  align-items: center;
  img {
    width: 100px;
    height: 100px;
  }
  > div {
    width: 280px;
    font-size: 16px;
    padding-left: 10px;
    .attr {
      font-size: 14px;
      color: #999;
    }
  }
}
.action {
  display: flex;
  background: #fff;
  margin-top: 20px;
  height: 80px;
  align-items: center;
  font-size: 16px;
  justify-content: space-between;
  padding: 0 30px;
  .xtx-checkbox {
    color: #999;
  }
  .batch {
    a {
      margin-left: 20px;
    }
  }
  .red {
    font-size: 18px;
    margin-right: 20px;
    font-weight: bold;
  }
}
.tit {
  color: #666;
  font-size: 16px;
  font-weight: normal;
  line-height: 50px;
}
.xtx-cart-page {
  .cart {
    background: #fff;
    color: #666;
    table {
      border-spacing: 0;
      border-collapse: collapse;
      line-height: 24px;
      th,td{
        padding: 10px;
        border-bottom: 1px solid #f5f5f5;
        &:first-child {
          text-align: left;
          padding-left: 30px;
          color: #999;
        }
      }
      th {
        font-size: 16px;
        font-weight: normal;
        line-height: 50px;
      }
    }
  }
}
</style>
